US2420476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Froth-flotation concentration of sylvite from sylvinite ores
Assignee: Minerals Separation North American Corp
•
Filing: 1944-06-13
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Granted: 1947-05-13
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Expires: 1964-06-13
Abstract
No abstract record available.
Inventors
- 👤 Ernest W Greene
- 👤 Joe R Sherertz
- 👤 Allen T Cole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:27
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/01; B03D1/006; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2088325A
Cited
US2222728A
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US2222331A
Cited
US2288497A
Cited
US2340523A
Cited
US2322789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-12 | 1950-11-11 | 1951-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-12 | 1954-11-11 | 1955-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-12 | 1958-11-11 | 1959-05-13 | $7700.00 | Window Closed / Lapsed |